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Math time:
the force that the engine has to exert to beat wind resistance at ~320kph (200mph, ~89m/sec) is:
0.5 x 0.34 (M4 cd) x 1.825 (car width) x 1.377 (car height) x 1.225 (typical air density) x 89 x 89 (m/sec equivalent of 200mph)
The above times 89m/sec gives you the power (power = force x speed, because energy = force x distance) and the power is something like 370Kw.
Which is about 490hp or 496 BHP or somewhere around the ballpark.
So if a car can push 500BHP at the wheels it could hit that mark.
IMHO the 0.34 cd is way too high, especially with no mention of any downforce at any speed, but at least it's good looking.
The E60 M5 had something like 0.26 which is like 25% better, so it could easily hit 200mph with 500 at the crank.
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